Non-aqueous electrolyte secondary battery and method for producing same

Abstract

The non-aqueous electrolyte secondary battery 10 according to the present invention is provided with an electrode body 50 including a positive electrode 64 that contains a positive electrode active material and a negative electrode 84 that contains a negative electrode active material, a non-aqueous electrolyte, and a battery case 15 that houses the electrode body and the non-aqueous electrolyte. The non-aqueous electrolyte contains a complex, which contains copper (I) chloride as a constituent component and which is capable of adsorbing at least carbon monoxide and carbon dioxide, and a coating film that contains at least one of phosphorus and boron is formed on the surface of the negative electrode active material.

The invention claimed is: 
     
       1. A method for producing a non-aqueous electrolyte secondary battery that is provided with: an electrode body including a positive electrode that contains a positive electrode active material, and a negative electrode that contains a negative electrode active material; a non-aqueous electrolyte; and a battery case that houses the electrode body and the non-aqueous electrolyte, the method comprising the steps of:
 preparing the positive electrode that contains the positive electrode active material, and the negative electrode that contains the negative electrode active material; 
 preparing the electrode body using the prepared positive electrode and negative electrode; 
 preparing an assembly by housing the electrode body in the battery case and introducing, into the battery case, the non-aqueous electrolyte which contains an oxalate complex compound containing at least one of phosphorus and boron as a constituent element, and a complex which contains copper (I) chloride as a constituent component and which is capable of adsorbing at least carbon monoxide and carbon dioxide; and 
 subjecting the assembly to initial charging until a prescribed charging voltage is reached. 
 
     
     
       2. The method according to  claim 1 , wherein a copper (I) chloride-pyridine complex is used as the complex which contains copper (I) chloride as the constituent component. 
     
     
       3. The method according to  claim 1 , wherein the non-aqueous electrolyte further contains a gas generating agent able to generate a gas through decomposition when the battery voltage exceeds a second prescribed voltage, and
 the battery case is provided with a current interrupt device that activates when the pressure inside the battery case rises as a result of the gas being generated. 
 
     
     
       4. The method according to  claim 1 , wherein the concentration of the complex which contains copper (I) chloride as the constituent component in the non-aqueous electrolyte is 16 mol/L to 56 mol/L relative to 1 mol/L of the oxalate complex compound. 
     
     
       5. The method according to  claim 1 , wherein the concentration of the oxalate complex compound in the non-aqueous electrolyte is 0.02 mol/L to 0.04 mol/L. 
     
     
       6. The method according to  claim 1 , wherein LiPF 2 (C 2 O 4 ) 2  is used as the oxalate complex compound.